Selection of Multi-layer Remote Phosphor Structure for Heightened Chromaticity as well as Lumen Performance within WLED Devices

Abstract

The hue output for remote phosphor layout is still a concern for researchers and producers working on developing WLED devices since said layout proves inferior to the conformal or in-cup phosphor package. However, the luminous efficiency in the layout showed significant improvements. Thus, this study aims to achieve higher color quality accompanied by high lumen output for remote phosphor structures by using additional phosphor layers. Specifically, the study introduces the double-film and triple-film configurations in which the red and green phosphors were added. The best structure for WLED applications is determined by comparing these structures. The influences of each phosphor structure are investigated and examined on optical parameters of WLEDs, which have different correlated hue temperatures between 5600 K and 8500 K. The optical features are CRI, CQS, color deviation (CD), and photoluminescence (PL). The results demonstrate that the triple-layer structure improved the color quality more effectively than the dual-layer structure due to higher attained CRI and CQS and smaller DC figures. The hypothesis of Miescattering indicates that the enhancement of scattering in the triple-layer is responsible for these achievements. Thus, the findings of this study are reliable and valuable for manufacturers.

Utilization of BaAl1.4Si0.6O3.4N0.6:Eu2+ Green-emitting Phosphor to Improve Luminous Intensity and Color Adequacy of White Light-emitting Diodes

“…Though the CRI is not as high as expected, the CQS on the other may be sufficient for general lighting. CQS is harder to manage than the CRI, especially at the high CCTs such as 5000 K. This is because the CQS is more complex in assessing elements which include the CRI, the visuality of eyes, and the color coordinate, combining with a larger number of color samples than the original CRI factor (Huu and Thi, 2022). Hence, the color adequacy for in terms of CCT consistency and rendition could be achieved with BaAl1.4Si0.6O3.4N0.6:Eu 2+ .…”

Ca8MgY(PO4)7:Eu2+,Mn2+: A Promising Phosphor in Near-Ultraviolet WLED Devices

“…For the study, we produced multiple CaMg:EM phosphors possessing crystal formation of β-Ca3(PO4)2 via the solid-state technique under a significant temperature below a reducing environment: 15% H2 along with 85% N2. We produced the usual white one-element phosphor having CIE hue coordinates shown as (0.330, 0.328) by altering the ratios between La 3+ and Y 3+ , as well as Eu 2+ and Mn 2+ via a hypothesis concerning crystal field potency, as well as power shift in both, whereas past projects concerning associated mixtures concentrated on power shift or achieved illumination in white through combining a pair of phosphor elements (Sun et al, 2022;Huu and Thi, 2022;Hakim et al, 2021).…”

The Light Features and Bredigite Layout for Orthosilicate Phosphor in WLED Devices

“…Such a procedure may yield a significant lumen exceeding 30 lm/W. On the other hand, it results in low CRI below 65, which is caused by a faint red discharge (Huu and Thi, 2022;Hakim et al, 2021). It is worth noting that the majority of phosphors do not possess an absorption line between 440 nm and 460 nm.…”